Initial commit: Complete CalDAV calendar synchronizer

- Rust-based CLI tool for Zoho to Nextcloud calendar sync
- Selective calendar import from Zoho to single Nextcloud calendar
- Timezone-aware event handling for next-week synchronization
- Comprehensive configuration system with TOML support
- CLI interface with debug, list, and sync operations
- Complete documentation and example configurations

Cargo.toml

@@ -0,0 +1,74 @@
+[package]
+name = "caldav-sync"
+version = "0.1.0"
+edition = "2021"
+authors = ["Your Name <your.email@example.com>"]
+description = "A CalDAV calendar synchronization tool"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/yourusername/caldav-sync"
+keywords = ["caldav", "calendar", "sync", "productivity"]
+categories = ["command-line-utilities", "date-and-time"]
+readme = "README.md"
+rust-version = "1.70.0"
+
+[dependencies]
+# Async runtime
+tokio = { version = "1.0", features = ["full"] }
+
+# HTTP client
+reqwest = { version = "0.11", features = ["json", "rustls-tls"] }
+
+# Serialization
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
+# Date and time handling
+chrono = { version = "0.4", features = ["serde"] }
+chrono-tz = "0.8"
+
+# XML parsing for CalDAV
+quick-xml = { version = "0.28", features = ["serialize"] }
+
+# Error handling
+thiserror = "1.0"
+anyhow = "1.0"
+
+# Configuration management
+config = "0.13"
+
+# Command line argument parsing
+clap = { version = "4.0", features = ["derive"] }
+
+# Logging and tracing
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
+
+# UUID generation for calendar items
+uuid = { version = "1.0", features = ["v4", "serde"] }
+
+# Base64 encoding for authentication
+base64 = "0.21"
+
+# URL parsing
+url = "2.3"
+
+# TOML parsing
+toml = "0.8"
+
+[dev-dependencies]
+tokio-test = "0.4"
+tempfile = "3.0"
+
+[[bin]]
+name = "caldav-sync"
+path = "src/main.rs"
+
+[profile.release]
+opt-level = 3
+lto = true
+codegen-units = 1
+panic = "abort"
+
+[profile.dev]
+debug = true
+opt-level = 0